outside air conversion

[anziani]

I just bought a '95 E420 that originally was sold in Canada. When the car was registered in California, a new US odometer was installed. However, the outside air temp still reads in Centigrade. How would one change this to Farenheit?
Another problem that came up was the headlights, taillights are on all of the time. While this may work in overcast Canada it is a little ridiculous in 365 days of bright sunshine. Can my "indie" handle this or should I go to a MB dealer?
Thanks in advance,
Anziani
'95 E420 90K
'91 190E 145K (sold)
'87 300E 170K